One problem related to engine cooling system has been reported for the 2011 Dodge Avenger. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Dodge Avenger based on all problems reported for the 2011 Avenger.
Passenger side heat blows weak cold air (dash, floor, and defroster). Windshield will not defrost. Heater core replaced, clogged with casting sand from manufacturer. Two weeks later, new core clogged. Mechanic spent most of one day continuously flushing engine/system. Sand still flushing out at end of day from heat/cooling system. Conditions are stationary or moving (any speed) with heater on. Unsure how long this was occurring as I rarely have a passenger. Driver's side seemed to work fine, so I did not notice until routinely transporting passenger and got worse to the point it was difficult seeing out of windshield.